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here you have a very good tool for Keyphrase Extraction. It is GNU and
easy to integrate in Lucene.
http://www.paynter.info/academia/Kea.php
best
jose
José Ramón Pérez Agüera
Dept. de Ingeniería del Software e Inteligencia Artificial
Despacho 411 tlf. 913947599
Facultad de Informática
Universidad Complutense de Madrid